<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <title>Title</title>
    <link rel="stylesheet" href="static/plugins/bootstrap-3.4.1/css/bootstrap.css">
    <!-- <link rel="stylesheet" href="/static/plugins/bootstrap-3.4.1/css/bootstrap.min.css"> -->
    <style>
        .account {
            width: 500px;
            border: 1px solid #dd0f0f;
            height: 350px;
            margin-left: auto;
            margin-right: auto;
            margin-top: 200px;
            padding: 20px 40px;
            border-radius: 5px;
            box-shadow: 5px 5px 5px #aaa;
        }

        .account h1 {
            text-align: center;
            margin-top: 10px;
        }
    </style>

</head>

<body>

    <div class="account">
        <h1>用户登录</h1>
        <form>
            <div class="form-group">
                <label for="exampleInputEmail1">用户名</label>
                <input type="email" class="form-control" id="exampleInputEmail1" placeholder="用户名">
            </div>
            <div class="form-group">
                <label for="exampleInputPassword1">Password</label>
                <input type="password" class="form-control" id="exampleInputPassword1" placeholder="密码">
            </div>
            <button type="submit" class="btn btn-default">登录</button>
        </form>

    </div>

</body>

</html>